I had a 28 that could shoot thru a Cherrio without scratching it, and Jay gave me a handful of 28 ga brush wads. They seemed to work pretty well. I had also tried using overshot cards divided evenly over each 1/4oz of shot (3/4oz loads) with noticeable opening. I can't say it didn't open up some holes in the pattern, not having shot them at the patterning board.
Some time ago, Frank Srebro posted a picture of a plexiglass template he had made for drawing a patterning paper. That could be handy if he could post it again.
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